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Imatest Documentation Severely distorted image This figure does not show the corrected grid image outside the crop. The different correction formulas (3rd order polynomial, 5th order polynomial, or tangent/arctangent) can only be compared inside the crop area, where optimum coefficients have been calculated. They don't look very different in this region. If Display corrected image in the input dialog box (Imatest Master only) is set to crop only or Always, the corrected image (shown below) is displayed. (The extreme corners are omitted for large amounts of barrel distortion). This figure is not perfect. It is calculated using a simple, fast algorithm that omits some pixels on the left and right. A semicircular "fingerprint" pattern" appears in their place. But is good enough to clearly illustrate the performance of the correction algorithm. (Another option, always - interpolated (SLOW!), produces a fine image without any gaps, but is too slow to be recommended.) In this case, some residual barrel distortion is visible in vertical grid lines on the left and right and some residual pincushion distortion is visible in the horizontal grid lines on the top and bottom. The average correction is quite good. The tangent/arctangent algorithm (used in Picture Window Pro) gives slightly better results for this image than the 5th order polynomial (which is normally most accurate), and much better than the 3rd order polynomial. This image has some perspective distortion: vertical convergence of lines. This results from the way the camera was pointed when the image was captured. It is not a lens aberration. 356 of 451
Imatest Documentation Intersection figure (Imatest Master only) Checking Plot intersection points in the input dialog box displays a second figure that contains intersection points (line crossings) designated by "+," "T," or "L." "+" intersection points are inside the pattern; "T" points are on the boundaries (top, bottom, and sides), and "L" points are on the corners. Intersection figure The image should be cropped so that only "+" intersection points (line crossings) are present inside the crop. Imatest doesn't like boundaries with "T" or "L" patterns inside the crop. To detect such patterns, they must be outside the crop (as shown above) and Detect points outside crop must be checked in the input dialog box. These points are not used in the for calculating distortion coefficients. The mean horizontal and vertical line spacings (∆X and ∆Y) are shown beneath the plot and in the optional CSV and XML files, along with the spacing ratios (the distortion aspect ratios), ∆Y ⁄ ∆X and ∆X ⁄ ∆Y. If the image contains letters or material unrelated to the the pattern, it should be edited out using an image editor. Picture Window Pro has a particularly convenient means of creating a rectangular mask for this purpose. The (x,y) coordinates of the displayed points are included in the optional .CSV and XML output files. These coordinates can be used for further analysis of geometric distortion. Thanks is due to Karl-Magnus Drake of the National Archives of Sweden for suggesting this figure. Radius correction figure (Imatest Master only) Checking Plot radius correction in the input dialog box displays a figure that contains detailed distortion/radius correction information, which can be useful for analyzing images like the one on the right, which has barrel distortion near the center but tends towards pincushion near the corners. 357 of 451
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Imatest Documentation © 2009 Imate
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Imatest Documentation Using SFRplus
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Imatest Documentation Instructions
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